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I have a 3-way light switch that I just replaced with a new illuminated one (glows when off). The light inside the switch is pulsating, like a heartbeat! I thought it was maybe a defective switch and changed it again with another new illuminated one, but still the same flickering. So it's definitely not the switch. What else would it be?

Additional context, this is part of a 4-way circuit in my hallway, including two 3-way switches and one 4-way switch. The lights turn on/off correctly, despite the flickering illuminated switch. And it's just one switch. I didn't change any of the wiring or terminal connections - just swapped old light switches for new ones.

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    Could you share a photo of the switch or its model number? In times past switches were illuminated with neon lamps which naturally have a characteristic flicker. LED illumination is a thing now, but I wonder whether the switch you chose uses neon. – Greg Hill Dec 4 '20 at 21:28
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    What model of switch? Are the lamps incandescent? Pulsating may mean a switch designed for incandescent lamps where ballasts or drivers used with CFL’s or LED’s don’t have the leakage path that an incandescent lamp has this would be my guess with the info provided. – Ed Beal Dec 4 '20 at 21:33
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What model of switch? Are the lamps incandescent? My answer with the info provided: Pulsating may mean a switch designed for incandescent lamps where ballasts or drivers used with CFL’s or LED’s. These lights don’t have the leakage path that an incandescent lamp has. this would be my guess with the info provided. In some cases older LED’s the switch lamp can cause your lights themselves to strobe like a heartbeat. Look up strobing LED and you will probably find similar issues like you have.

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